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article by Jane E. Nielson published 1998 in Open-File Report

scientific article published in 1999

scholarly article

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scientific article published in 1993

scientific article published in 1980

1974 thesis (Ph.D.) submitted to Stanford University by Jane Nielson

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article by D. M. Miller et al published 1991 in Open-File Report

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scientific article published in 1993

scientific article published in 1993

scientific article published in 1993